I have the two classes shown below. When trying to insert two HeroEntry with the same IdentityId, the context is only saving one of the two entries. Any ideas what I am doing wrong?
public class Identity
{
[Key]
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public int IdentityId { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
public string Email { get; set; }
public string Phone { get; set; }
[JsonIgnore]
public virtual HeroEntry HeroEntry { get; set; }
}
public class HeroEntry
{
[Key]
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public int HeroEntryId { get; set; }
public int IdentityId { get; set; }
public SuperHeroEnum HeroType { get; set; }
public DateTime Startdate { get; set; }
public DateTime EndDate { get; set; }
[ForeignKey("IdentityId")]
public virtual Identity Identity { get; set; }
public virtual List<SuperHeroBreak> SuperHeroBreaks { get; set; }
}
Add code:
var b = new HeroEntry()
{
HeroType = SuperHeroEnum.BATMAN,
Startdate = DateTime.Parse("12/24/2018"),
EndDate = DateTime.Parse("01/04/2019"),
IdentityId = 1,
};
var r = new HeroEntry()
{
HeroType = SuperHeroEnum.ROBIN,
Startdate = DateTime.Parse("12/24/2018"),
EndDate = DateTime.Parse("01/04/2019"),
IdentityId = 1,
};
context.SuperHeroes.AddRange(b, r);
var affected = context.SaveChanges();
Cristian was correct. Adding the navigation property to the identity class solved my issue. Thank you for the help!
Related
I don't know if I am doing this right. I have 2 tables Property and PropertyTypes. Each Property has 1 PropertyType. I am using a foreign key constraint. But on the creation of the controller, I get this error already:
"Could not find an implementation of the query pattern for source type 'DbSet'.'Join not found'
Please see my code below:
[Table("Property.Property")]
public class Property
{
[Key]
public int PropertyId { get; set; }
[StringLength(50)]
public string PropertyName { get; set; }
public int? Owner { get; set; }
public string Cluster { get; set; }
public string PropertyNumber { get; set; }
public string RegionCode { get; set; }
public string ProvinceCode { get; set; }
public string MunicipalCode { get; set; }
public string BarangayCode { get; set; }
public DateTime? DateAdded { get; set; }
public DateTime? DateModified { get; set; }
public int PropertyTypeId { get; set; }
public PropertyType PropertyType { get; set; }
[NotMapped]
public string Type { get; set; }
}
[Table("Property.Types")]
public class PropertyType
{
[Key]
public int PropertyTypeId { get; set; }
[StringLength(50)]
public string Type { get; set; }
public DateTime? DateAdded { get; set; }
public DateTime? DateModified { get; set; }
public List<Property> Properties { get; set; }
}
public class ApplicationDbContext : IdentityDbContext<ApplicationUser>
{
public ApplicationDbContext()
: base("DefaultConnection", throwIfV1Schema: false) {}
// DB Sets
public DbSet<Property> Properties { get; set; }
public DbSet<PropertyType> PropertyTypes { get; set; }
}
Controller
public class PropertyController : ApiController
{
[HttpGet]
[Authorize]
[Route("api/getproperties")]
public async Task<List<Property>> GetProperties()
{
using(var db = new ApplicationDbContext())
{
var properties = await (from p in db.Properties
join pt in db.PropertyTypes
on p.PropertyTypeId equals pt.PropertyTypeId
select new
{
PropertyId = p.PropertyId,
PropertyName = p.PropertyName,
Owner = p.ProertyOwner,
Cluster = p.Cluster,
PropertyNumber = p.PropertyNumber,
RegionCode = p.RegionCode,
ProvinceCode = p.ProvinceCode,
MunicipalCode = p.MunicipalCode,
BarangayCode = p.BarangayCode,
DateAdded = p.DateAdded,
DateModified = p.DateModified,
PropertyTypeId = p.PropertyTypeId,
type = pt.Type
}
).ToListAsync();
return properties;
}
}
}
Can you please show me the right way to do this? Thank you.
I have five tables in database whose Entity classes are as follows -
Product
public int ProductId { get; set; }
public string Name { get; set; }
public int Category { get; set; }
public string Description { get; set; }
public string Brand { get; set; }
public virtual ProductCategory ProductCategory { get; set; }
public virtual ICollection<ProductImage> ProductImages { get; set; }
public virtual ICollection<ProductVariantMapping> ProductVariantMappings
ProductCategory
public int CategoryId { get; set; }
public string Name { get; set; }
public virtual ICollection<Product> Products { get; set; }
ProductImage
public int ProductImageId { get; set; }
public int ProductId { get; set; }
public byte[] Image { get; set; }
public virtual Product Product { get; set; }
ProductVariantMapping
public int MappingId { get; set; }
public int ProductId { get; set; }
public int ProductVariantId { get; set; }
public string Value { get; set; }
public System.Guid GUID { get; set; }
public virtual Product Product { get; set; }
public virtual ProductVariant ProductVariant { get; set; }
ProductVariant
public int ProductVariantId { get; set; }
public string Name { get; set; }
public string Description { get; set; }
public virtual ICollection<ProductVariantMapping> ProductVariantMappings
I want to get Product Details which should include ProductId, ProductName, Category, Description, Brand, Image(Only 1 for now), and Variants*
*Variants would be a list of all the variants of a product. A single variant can be a combination of all the VariantIds with same GUIDs. (VariantName is in ProductVariant table and VariantValue is in ProductVariantMapping table and Price is in inventory table).
So, I used method-based linq for this purpose.
EkartEntities ekartEntities = new EkartEntities();
var productDetails = ekartEntities.Products.Include(p =>
p.ProductVariantMappings).Include(p => p.ProductImages).Include(p =>
p.ProductCategory).Where(p => p.ProductId ==
productDetailDTO.ProductId).ToList();
Now I have to convert my product into a ProductDetailDTO.
ProductDetailDTO
public class ProductDetailDTO
{
public int ProductId { get; set; }
public string Name { get; set; }
public string Category { get; set; }
public byte[] Image { get; set; }
public string Description { get; set; }
public string Brand { get; set; }
public List<Variant> Variants { get; set; }
}
public class Variant
{
public string Name { get; set; }
public string Value { get; set; }
public System.Guid Guid { get; set; }
public decimal Price { get; set; }
}
I started doing this like this -
void ToDTO(List<Product> products)
{
EkartEntities ekartEntities = new EkartEntities();
ProductDetailDTO productDetailDTO = new ProductDetailDTO();
foreach (var item in products)
{
productDetailDTO.ProductId = item.ProductId;
productDetailDTO.Name = item.Name;
productDetailDTO.Category = item.ProductCategory.Name;
productDetailDTO.Description = item.Description;
productDetailDTO.Brand = item.Brand;
productDetailDTO.Image = item.ProductImages.ElementAt(0).Image;
foreach (var variant in item.ProductVariantMappings)
{
productDetailDTO.Variants = variant.ProductVariant // ?
}
}
}
I don't know how do I proceed further. How can I extract the variant based on the GUIDs?
The logic of combining of ProductVariant entries with same GUID in mapping table doesn't seem clear from the question, however you can group entries in ProductVariantMappings by GUID and then add any logc you like on group. Here is an example where I take first name and value in a groub of variant with the same GUID:
void ToDTO(List<Product> products)
{
EkartEntities ekartEntities = new EkartEntities();
ProductDetailDTO productDetailDTO = new ProductDetailDTO();
foreach (var item in products)
{
productDetailDTO.ProductId = item.ProductId;
productDetailDTO.Name = item.Name;
productDetailDTO.Category = item.ProductCategory.Name;
productDetailDTO.Description = item.Description;
productDetailDTO.Brand = item.Brand;
productDetailDTO.Image = item.ProductImages.ElementAt(0).Image;
productDetailDTO.Variants = item.ProductVariantMappings
.GroupBy(pm => pm.GUID)
.Select(g => new Variant
{
Guid = g.Key,
// Here should be some logic for getting a name of the combination of Variants
// I just take first
Name = g.FirstOrDefault()?.ProductVariant?.Name,
// Here should be some logic for getting a value of the combination of Variants
// Take first again
Value = g.FirstOrDefault()?.Value,
Price = // need inventory table to compute price
})
.ToList();
}
}
Also note that you need somehow add relation to inventory table, which is not presented in question. Hope it helps.
When creating many to many relationship using EF 4.3 code first approach, I cannot save data to connecting table, also cannot any examples on how to fill this table using saving object to Icollection... Here is my example:
MODELS
public class Hospital
{
//PK
[Key]
public int Id { get; set; }
public string Name { get; set; }
public string Address { get; set; }
public string City { get; set; }
public string County { get; set; }
public string UserName { get; set; }
public string Password { get; set; }
public Guid User_Id { get; set; }
//FK
public virtual ICollection<Operator> Operators { get; set; }
}
public class Operator
{
//PK
[Key]
public int Id { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
public DateTime Dob { get; set; }
public string Email { get; set; }
//FK
public virtual ICollection<Hospital> Hospitals { get; set; }
}
public class Project: DbContext
{
public DbSet<Hospital> Hospitals { get; set; }
public DbSet<Operator> Operators { get; set; }
}
CONTROLLER
public void AddOperater()
{
Hospital h = new Hospital();
h = db.Hospitals.Single(a=>a.Id ==1);
var o = new Operator();
o.FirstName = "John";
o.LastName = "Doe";
o.Dob = new DateTime(1988,2,12);
o.Email = "johndoe#gmail.com";
o.Hospitals.Add(h);
db.SaveChanges();
}
With this approach I keep getting error here: o.Hospitals.Add(h); even when my Hospital instance is filled with data. How exactly to save data to both tables, the dbo.Operators and dbo.OperatorHospital which is relationship table?
o.Hospitals.Add(h) will fail because the list is a null list. You cannot call Add() on a null list. Typically most people get around this by instantiating the list in the constructor of the entity... like so... the current line is blowing up due to a CSharp issue.
public class Hospital
{
//PK
[Key]
public int Id { get; set; }
public string Name { get; set; }
public string Address { get; set; }
public string City { get; set; }
public string County { get; set; }
public string UserName { get; set; }
public string Password { get; set; }
public Guid User_Id { get; set; }
//FK
public virtual ICollection<Operator> Operators { get; set; }
public Hospital()
{
Operators = new List<Operator>();
}
}
public class Operator
{
//PK
[Key]
public int Id { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
public DateTime Dob { get; set; }
public string Email { get; set; }
//FK
public virtual ICollection<Hospital> Hospitals { get; set; }
public Operator()
{
Hospitals = new List<Hospital>();
}
}
The problem I'm encountering is when I try to insert a new record in a ASPxGridView which is a master of detail in an asp.net page.
This only occurs when adding a new record is required when there is no record.
EnderecoEscola entity:
namespace DAL
{
[Table("CAD_ENDERECO_ESCOLA")]
public class EnderecoEscola
{
[Key]
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public int ENDESC_ID { get; set; }
[Required]
public int ESCOLA_ID { get; set; }
[Association("Escolas", "ESCOLA_ID", "ESCOLA_ID")]
[ForeignKey("ESCOLA_ID")]
public virtual Escola Escola { get; set; }
[Required]
public int TPOEND_ID { get; set; }
[ForeignKey("TPOEND_ID")]
public virtual TipoEndereco TipoEndereco { get; set; }
[Required]
public int ENDESC_UF_ID { get; set; }
[ForeignKey("ENDESC_UF_ID")]
public virtual UnidadeFederativa UnidadeFederativa { get; set; }
[Required]
public int ENDESC_MUN_iD { get; set; }
[ForeignKey("ENDESC_MUN_iD")]
public virtual Municipio Municipio { get; set; }
[StringLength(10), Required]
[MinLength(8)]
public string ENDESC_CEP { get; set; }
[StringLength(100), Required]
[MinLength(10)]
public string ENDESC_ENDERECO { get; set; }
[StringLength(15)]
public string ENDESC_NRO { get; set; }
[StringLength(25)]
public string ENDESC_COMPL { get; set; }
[StringLength(70)]
public string ENDESC_BAIRRO { get; set; }
[NotMapped]
public String TPEND_DESCRICAO { get; set; }
[NotMapped]
public String UF_SIGLA { get; set; }
[NotMapped]
public String MUN_DESCRICAO { get; set; }
}
}
DAL :
namespace DAL.utilities
{
public class OperationCadEnderecoEscola
{
public IQueryable<EnderecoEscola> GetId(int idEsc)
{
using (SecurityCtx ctx = new SecurityCtx())
{
ctx.Configuration.LazyLoadingEnabled = false;
var query = ctx.EnderecoEscola.Include("TipoEndereco").Include("UnidadeFederativa").Include("Municipio").Where(w => w.ESCOLA_ID == idEsc).OrderBy(p => p.ENDESC_ENDERECO).ToList().
Select(w => new EnderecoEscola
{
ENDESC_ID = w.ENDESC_ID,
ESCOLA_ID = w.ESCOLA_ID,
TPOEND_ID = w.TPOEND_ID,
ENDESC_UF_ID = w.ENDESC_UF_ID,
ENDESC_MUN_iD = w.ENDESC_MUN_iD,
ENDESC_CEP = w.ENDESC_CEP,
ENDESC_ENDERECO = w.ENDESC_ENDERECO,
ENDESC_NRO = w.ENDESC_NRO,
ENDESC_COMPL = w.ENDESC_COMPL,
ENDESC_BAIRRO = w.ENDESC_BAIRRO,
TPEND_DESCRICAO = w.TipoEndereco.TPEND_DESCRICAO != null ? w.TipoEndereco.TPEND_DESCRICAO : w.TPEND_DESCRICAO,
UF_SIGLA = w.UnidadeFederativa.UF_SIGLA != null ? w.UnidadeFederativa.UF_SIGLA : w.UF_SIGLA,
MUN_DESCRICAO = w.Municipio.MUN_DESCRICAO != null ? w.Municipio.MUN_DESCRICAO : w.MUN_DESCRICAO
}).Distinct().AsQueryable();
return query;
}
}
}
}
When applying for inclusion in ASPxGridView a new record and the method in DAL public IQueryable <EnderecoEscola> getId (int idEsc) is invoked to retrieve the data and they do not exists it is adding a new record on the master and detail occurs error
A field or property with name 'TPEND_DESCRICAO' was not found in the
selected data source.
Someone could guide me on how to solve the problem.
Tks.
I've got a definition like below and essentially, I want to create this in the EmailAccount class:
public EmailUser? EmailUserAccountInfo {get;set;}
the compiler gives me an error about non-nullable types. My goal is I want to make the EmailUser optional. I'm kind of confused because I can set EmailUserAccountInfo = null directly.
var r = new EmailAccount()
{
EmailUserAccountInfo = null,
Id = 1001
};
public class EmailAccount
{
[Key]
[DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)]
public int Id { get; set; }
public EmailUser EmailUserAccountInfo { get; set; }
}
public class EmailUser
{
[Key]
[DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)]
public int Id { get; set; }
public EmailAccount EmailAcount { get; set; }
public string EmailAddress { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
public string ZipCode { get; set; }
public string City { get; set; }
public string State { get; set; }
public int Temperature { get; set; }
public string WeatherString { get; set; }
public ImageDetail ImageOfUser { get; set; }
}
You can do this if you add a foreign key and you mark that nullable:
public class EmailAccount
{
[Key]
[DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)]
public int Id { get; set; }
// Foreign key
public int? EmailUserAccountInfoId { get; set; }
// Navigation property
public virtual EmailUser EmailUserAccountInfo { get; set; }
}
See this document about naming conventions for Code-First. (Scroll down to Relationship Convention)